JP2005114133A - Power transmission chain and power transmission unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission chain capable of controlling the occurrence of an abnormal wear and abnormal slide effectively even if there is the misalignment between pulleys. <P>SOLUTION: The power transmission chain is equipped with plural link plates 20 and plural pins 30. In a central part of widthwise direction of the power transmission chain, the adjacent link plates 20 are arranged almost without space and more narrowly disposed at the center in the widthwise direction than the disposition at its end, which gives flexibility to the whole chain. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power transmission chain used in a so-called chain type continuously variable transmission or the like employed in a vehicle or the like, and a power transmission device using the power transmission chain.

As a continuously variable transmission (CVT) of an automobile, for example, a drive pulley provided on the engine side, a driven pulley provided on the drive wheel side, and a plurality of link plates bridged between the two And an endless chain having a plurality of pins connecting them to each other. In such a so-called chain type continuously variable transmission, the conical sheave surface of each pulley and a part of the chain constituent member such as the pin end surface of the chain make a slight sliding contact in the circumferential direction of the sheave surface. Thus, traction is generated, and power is transmitted by this traction. Then, by continuously changing the groove width (distance between sheave surfaces) of at least one of the drive pulley and the driven pulley, it is possible to perform a continuously variable transmission with a smooth movement different from the conventional gear type. .
In such a chain type continuously variable transmission, the chain is configured by press-fitting pins and strips into the through holes of the link plate in order to transmit power with high efficiency (see, for example, Patent Document 1).

JP-A-8-312725 (page 4)

  However, the chain as described above can be bent with respect to the direction in which each pulley is wound in the circumferential direction (hereinafter referred to as “circumferential bending”), but it can be moved almost in other directions. 7 (a) to 7 (c), misalignment A and pulleys that cause a deviation in the horizontal direction (direction perpendicular to the chain longitudinal direction) between the drive pulley 60 and the driven pulley 70, as shown in FIGS. If there is a misalignment B that occurs when 60 and 70 are directed in different directions, a misalignment C that occurs when the pulleys 60 and 70 rotate so as to be twisted, and a misalignment that is a combination of these, the winding angle is particularly large. It is difficult to perform proper clamping with a pulley on the smaller side. For this reason, if power is transmitted over a long period of time, contact between the sheave surface of the pulley and the chain side contact surface such as the pin end surface will occur, causing abnormal wear on the sheave surface of the pulley or the chain side contact surface. There is a problem that abnormal slip occurs between the sheave surface of the pulley and the chain-side contact surface. For this reason, in a power transmission device such as a chain-type continuously variable transmission, development of a technology having a large allowable range of misalignment between pulleys is desired.

  The present invention has been made in view of such circumstances, and a power transmission chain that can effectively suppress the occurrence of abnormal wear and abnormal slip even if misalignment exists between pulleys, and power transmission using the power transmission chain The purpose is to provide a device.

  The power transmission chain according to the present invention includes at least a plurality of link plates having pin holes as chain constituent members, and a plurality of pins that are inserted into the pin holes and connect the plurality of link plates. A pitch portion in which a plurality of the link plates are arranged between two adjacent pins is continuously connected in the chain longitudinal direction, and a first pulley having a conical sheave surface and a conical surface A power transmission chain that is used by being bridged between a second pulley having a sheave surface and that transmits power by contacting the chain constituent members and the sheave surfaces of the first and second pulleys. And at least one of the pitch portions is a centrally-distributed pitch portion in which the link plate is unevenly distributed in a range near the center in the chain width direction. There.

  According to the configuration of the power transmission chain, the link plate closer to the left and right ends, which restrains the bending of the pitch part other than the circumferential bending of the pitch part relatively strongly in the centrally-distributed pitch part, is compared to the central part in the chain width direction. Thus, a rough arrangement is made such that the interval between adjacent link plates is wide. For this reason, the restraining force of bending other than the bending in the circumferential direction of the pitch portion is reduced, and the bending becomes flexible. Therefore, flexibility can be provided to the entire chain by disposing at least one central uneven pitch portion having flexibility in the chain. This makes it possible to flexibly follow the misalignment that exists between the pulleys, resulting in a single contact between the chain-side contact surface and the sheave surface of the pulley, and the pulley cannot properly clamp the chain. Can be effectively suppressed.

  Furthermore, the power transmission chain of the present invention includes at least a plurality of link plates having pin holes as chain constituent members, and a plurality of pins that are inserted into the pin holes and connect the plurality of link plates. A first pulley having a conical surface-like sheave surface and a conical surface shape, wherein a pitch portion in which a plurality of the link plates are arranged between two pins adjacent to each other is connected continuously in the longitudinal direction of the chain A chain for power transmission that is used by being bridged between a second pulley having a sheave surface and transmitting the power by contacting the sheave surfaces of the chain constituent member and the first and second pulleys. And at least one of the pitch portions is all links constituting the pitch portion in a range closer to the center of the chain width direction and narrower than the entire chain width. It is characterized in that the rate is centralized pitch portion having an array of.

  According to the above configuration, the central concentrated pitch portion is arranged with all link plates configured in a range narrower than the entire width of the chain, so that the bending of the pitch portion other than the circumferential bending is relatively strongly restrained. There is no link plate near the left and right ends in the chain width direction. For this reason, the said central concentration pitch part comes to have a softness | flexibility with respect to bending | flexion other than circumferential bending. Therefore, the flexibility can be imparted to the entire chain by disposing at least one pitch portion having the flexibility in the chain.

  Further, in the power transmission chain, it is preferable that the central concentrated pitch portion is arranged such that all of the plurality of link plates constituting the pitch portion are overlapped with substantially no gap near the center in the chain width direction. In this case, in the central concentrated pitch portion, since the link plates are arranged most concentrated near the center, the flexibility for bending other than the circumferential bending can be further increased.

  All of the plurality of link plates constituting the pitch portion are arranged adjacent to both sides in the chain longitudinal direction of the central concentrated pitch portion, which are arranged so as to be overlapped without any gap near the center in the chain width direction. It is preferable that both end concentrated pitch portions are arranged such that the link plates are arranged at both ends in the chain width direction rather than the link plates arranged at the central concentrated pitch portion. In this case, by connecting the central concentrated pitch portion to the central concentrated pitch portion, the link plate arrangement when connecting the central concentrated pitch portion to the chain can be facilitated.

The power transmission device of the present invention is spanned between a first pulley having a conical sheave surface, a second pulley having a conical sheave surface, and the first and second pulleys. And a power transmission chain, wherein the power transmission chain is the power transmission chain described above.
According to the above configuration, even if there is a misalignment between the first pulley and the second pulley, the above-described power transmission chain allows the misalignment, so that abnormal wear or slippage occurs. Effectively suppressed.

As described above, the power transmission chain according to the present invention allows misalignment of pulleys and can effectively suppress the occurrence of abnormal wear and abnormal slip.
Further, since the power transmission device of the present invention uses the above-described chain, abnormal wear and abnormal slip are effectively suppressed, and power transmission can be performed stably over a long period of time.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing a main configuration of a chain for a so-called chain-type continuously variable transmission (hereinafter also simply referred to as “chain”) according to a first embodiment of a power transmission chain of the present invention. In the figure, a chain 1 according to the present embodiment is endless, and includes a plurality of link plates 20 made of metal (carbon steel or the like) as chain constituent members and a plurality of links for connecting the link plates 20 to each other. These pins 30 are made of a metal (bearing steel or the like) pin 30 and a strip 40 slightly shorter than these pins 30. In FIG. 1, the description of the central portion in the width direction of the chain 1 is partially omitted.

  The link plate 20 has a shape in which the outline is a gentle curve, is provided with two through holes 21 per sheet, and is formed so as to have substantially the same outline. The pins 30 are rod-shaped bodies having side surfaces along the inner peripheral surface of the through hole 21 and are all formed in substantially the same shape. The pin end surface 31 is set to a predetermined curvature, contacts a sheave inclined surface (not shown) of the pulley, and transmits power. And this pin 30 is comprised so that it may penetrate in the through-hole 21 of each link plate 20 arranged in the width direction of the chain 1, and may connect each link plate 20. As shown in FIG. The strip 40 is a rod-like body having a side surface along the inner peripheral surface of the through-hole 21 that is formed slightly shorter than the pin 30 so as not to come into contact with the sheave surface, and is formed in substantially the same shape. is there. The strip 40 is press-fitted into the through hole 21 so that its side surface rolls and slides with the side surface of the pin 30.

  FIG. 2 is a diagram schematically showing an arrangement state of the central uneven pitch portion 52, which is a characteristic component according to the present embodiment, with respect to the entire chain 1. FIG. Here, the pitch portion refers to a part of the chain 1 formed by arranging a predetermined number of link plates 20 between two pins 30 adjacent in the longitudinal direction of the chain 1. The chain 1 is connected so that the plurality of pitch portions are continuously connected in the longitudinal direction of the chain, and at the same time bendable with respect to the direction in which the chain 1 is wound in the circumferential direction of the pulley. In FIG. 2, the individual pitch portions are represented in a rectangular parallelepiped shape, and are represented as if they are connected to form a chain 1. The hatched portion in the figure is the centrally-distributed pitch portion 52, and the non-hatched portion is the pitch portion 51 in which link plates 20 described later are arranged at equal intervals in the chain width direction (FIG. 3). A fixed number of pitch portions that are not the centrally-distributed pitch portions 52 such as (see) are connected. As described above, the chain 1 according to this embodiment is configured such that the central uneven pitch portion 52 is always connected at a constant interval with respect to the longitudinal direction of the chain.

Next, FIG. 3 shows an arrangement of the link plates 20 in the central uneven pitch portion 52. The centrally-distributed pitch portion 52 includes two adjacent pins 30a, five link plates 20a arranged between the two pins 30a toward the center in the chain width direction, and the chain width direction from 20a. The four link plates 20b are arranged near the ends. Here, the link plates 20a, 20b, and 20c in FIG. 3 have substantially the same shape as the above-described link plate 20, and are denoted by different symbols in order to describe the arrangement of the link plates 20 below. Similarly, the pin 30 a has substantially the same shape as the above-described pin 30, and is given another symbol for explaining the pin 30 constituting the centrally-distributed pitch portion 52.
And the link plate of this center uneven distribution pitch part 52 is arranged as follows. That is, the five link plates 20a are arranged so as to be substantially overlapped near the center of the chain 1 in the width direction, and the remaining four link plates 20b are arranged on the left and right sides near the end of the chain 1 in the width direction. . The link plates 20b that are arranged adjacent to the left and right of the five link plates 20a that are arranged so as to overlap each other substantially without any gap are connected to the pitch portions 53 that are connected adjacent to both sides in the longitudinal direction of the central uneven pitch portion 52. The three link plates 20c arranged on the left and right sides are arranged with an interval of about three of the thickness of the link plate 20 on the left and right. The link plate 20b arranged on the end side in the chain width direction of the link plate 20b arranged at an interval is sandwiched between the one link plate 20 arranged in the pitch portion 53. Are arranged on the left and right sides of the end portion in the chain width direction with an interval of about one sheet of thickness. That is, the arrangement of the link plates 20b is a coarse arrangement in which the interval between the adjacent link plates is wide compared to the arrangement of the five link plates 20a. The pitch portion 53 connected adjacent to both sides in the longitudinal direction of the centrally-distributed pitch portion 52 and the pitch portion 54 connected to the other of the pitch portions 53 not connected to the centrally-distributed pitch portion 52 have the link plate 20 in the chain width direction. The link plates 20 are arranged so that the pitch portions 51 arranged at equal intervals can be connected.

  In the power transmission chain according to the present embodiment configured as described above, the centrally-distributed pitch portion 52 is arranged near the left and right ends that relatively restrain the bending of the pitch portion other than the circumferential bending. The link plate 20 has a rough arrangement in which the interval between adjacent link plates is wider than that near the center in the chain width direction. For this reason, the restraining force of bending other than the bending in the circumferential direction of the pitch portion is reduced, and the bending becomes flexible. And since the centrally distributed pitch part 52 to which the said softness | flexibility was provided is arrange | positioned for every fixed space | interval in the chain longitudinal direction, a softness | flexibility can be provided with respect to the chain 1 whole. As a result, the flexibility is exhibited even in the misalignment direction existing between the pulleys. Therefore, even if it is incorporated into the power transmission device and power is transmitted for a long time, it is between the sheave surface of the pulley and the pin end surface. Thus, it is possible to suppress the occurrence of abnormal wear or the occurrence of abnormal slip.

Here, the center unevenly distributed pitch part and its modification will be described with reference to specific examples. FIG. 4 schematically shows the arrangement of the link plates 20 with respect to the entire chain width of one pitch portion. In FIG. 4A, all the link plates 20 are arranged at equal intervals. On the other hand, (b) is arranged in such a manner that three sheets are overlapped at the center with substantially no gap, and the other link plates 20 are arranged at equal intervals at intervals of about one sheet of the thickness of the link plate 20 on the left and right. (C) is arranged in the center so that four sheets are overlapped with almost no gap, and the other link plates 20 are arranged at equal intervals at intervals of about one sheet of the thickness of the link plate 20 on the left and right. In (d), two sets of three link plates 20 arranged in the center with substantially no gap are arranged at an interval of about one sheet of the thickness of the link plate 20. The three link plates 20 arranged adjacent to each other in the chain width direction end side of the link plate 20 that are arranged so as to overlap each other with almost no gap are left and right with an interval of about one of the thickness of the link plate 20 left and right. Is arranged. The link plate 20 arranged on the end side in the chain width direction of the link plate 20 arranged with an interval of about one thickness of the link plate 20 is about three pieces of the thickness of the link plate 20. They are arranged on the left and right sides of the end in the chain width direction with a gap.
As shown in FIGS. 4B to 4D, the centrally-distributed pitch portion has at least one link plate 20 arranged at both ends in the vicinity of both ends of the entire width of the chain, and is adjacent to the center in the chain width direction. This means a pitch portion in which the link plates 20 are arranged substantially without gaps, or are arranged narrower than near the ends in the chain width direction. Needless to say, the central uneven pitch portion is not limited to the example shown in FIG. Further, in the central uneven pitch portion, the number of the link plates 20 constituting the portion arranged near the center in the chain width direction without a substantial gap or arranged in a narrower interval than the end portion in the chain width direction, The number is preferably more than 1/3 of the total number of link plates 20 arranged in the pitch portion. The arrangement of the link plates 20 arranged near the left and right ends of the pitch portion in the chain width direction is easy to make a rough arrangement in which the interval between the adjacent link plates is wide, and the binding force of bending other than the circumferential bending is effective. This is because it can be lowered.

  Next, a second embodiment of the present invention will be described. FIG. 5 is an upper plan view showing the arrangement of the link plates 20 in the central concentrated pitch portion which is a characteristic component according to the second embodiment. Since the main configuration is the same as that of the first embodiment, a description thereof will be omitted. In the chain 1 according to the present embodiment, the central concentrated pitch portion 55 shown in FIG. 5 is always spaced apart from the longitudinal direction of the chain by the same manner as the centrally-distributed pitch portion 52 in FIG. 3 according to the first embodiment. It is comprised so that it may be connected. Here, the central concentrated pitch portion refers to a pitch portion in which all link plates 20 constituting the pitch portion are arranged in a range closer to the center in the width direction of the chain 1 and narrower than the entire width of the chain. The central concentrated pitch portion is different from the central uneven pitch portion in that the link plate 20 is not arranged near both ends of the entire chain width. Further, the total chain width refers to the width of the pitch portions arranged with the widest width in the chain width direction in the chain 1 as indicated by D in FIG. The central concentrated pitch portion 55 is composed of two pins 30b and nine link plates 20d, and all nine link plates 20d arranged between the two pins 30b are connected to the chain 1 in the width direction. They are arranged near the center with almost no gaps. The pitch portion 56 connected adjacent to both ends of the central concentrated pitch portion 55 in the longitudinal direction of the chain is composed of 10 link plates 20e, and approximately 5 link plates 20e are provided near the left and right ends in the chain width direction. The two end concentrated pitch portions are arranged so as to be overlapped with no gap and arranged so as to sandwich the nine link plates 20d constituting the central concentrated pitch portion 55 from both sides. The both-end concentrated pitch portion refers to a pitch portion in which the link plates 20e are arranged so as to overlap each other at both ends in the chain width direction with respect to the link plate 20d arranged in the central concentrated pitch portion 55 with substantially no gap. On the other side of the concentrated pitch portion 56 at both ends not connected to the central concentrated pitch portion 55, a pitch portion 57 on which nine link plates 20 are arranged is connected, and the link plates 20 are arranged at equal intervals in the chain width direction. The link plates 20 are arranged so that the pitch portions 51 can be connected. In this way, the pitch portion adjacent to and connected to the central concentrated pitch portion 55 in the longitudinal direction of the chain is the double-end concentrated pitch portion 56, thereby facilitating the arrangement of the link plates 20 in the other connected pitch portions. It is supposed to be.

  Compared with the chain 1 shown in the first embodiment, the chain according to the present embodiment is such that all the link plates 20 arranged in the central concentrated pitch portion 55 to which flexibility is imparted are all substantially free of gaps toward the center. It is different in that they are arranged in layers. In this case, since there is no link plate near the left and right ends that restrains the bending other than the circumferential bending of the central concentrated pitch portion 55, the central concentrated pitch portion 55 has flexibility with respect to bending other than the circumferential bending. Preferably obtained. The chain 1 as a whole can be given flexibility, allowing misalignment existing between the pulleys, causing abnormal wear between the sheave surface of the pulley and the pin end surface, and abnormal slippage. Can be suppressed. Furthermore, in the first embodiment, when the chain is bent in a direction other than the circumferential bending so as to allow misalignment, the stress is concentrated on the link plate 20 arranged near the end in the chain width direction of the central uneven pitch portion 52. And may break. According to the central concentrated pitch portion of the present embodiment, the link plate is not arranged near the end of the chain 1, so that it is not necessary to take this into consideration. Similarly, when the chain is bent in a direction other than the circumferential bending, the link plate 20 is arranged near the left and right ends in the chain width direction at the both ends concentrated pitch portion 56, so that it is closer to the end in the chain width direction. Even when stress concentrates on the link plate 20, the link plate 20 can be made difficult to break.

  In the chain of each embodiment described above, the number of the link plates 20 constituting the centrally-distributed pitch portion 52 and the central concentrated pitch portion 55 is one less than the other connected pitch portions. This is because the ease of connection of the unevenly-distributed pitch portion 52 and the central concentrated pitch portion 55 to other pitch portions is considered, and the centrally-distributed pitch portion 52 and the central concentrated pitch portion 55 are configured depending on the arrangement of the link plates 20. There may be a case where the number of link plates 20 is one more than the other connected pitch portions. In the above embodiment, all the pitch parts other than the centrally-distributed pitch part 52 and the central concentrated pitch part 55 are alternately connected to the pitch part composed of nine link plates 20 and the pitch part composed of ten sheets. Therefore, even if the central uneven pitch portion 52 and the central concentrated pitch portion 55 are configured by nine pieces, the breaking strength in the tensile direction of the chain 1 is not lowered. However, when the breaking strength in the pulling direction of the chain is taken into consideration, the number of link plates 20 of the centrally distributed pitch portion 52 and the central concentrated pitch portion 55 may be configured to be the same as the other pitch portions to be connected. preferable.

  Moreover, the power transmission chain according to the present invention is usually configured with 75 to 90 pins, and the pitch portion is similarly configured with 75 to 90 pins. Among them, the number of centrally-distributed pitch portions or centrally-concentrated pitch portions is 25 to 30 with respect to the whole chain, that is, the centrally-distributed pitch portions or centrally-concentrated pitch portions are 1 in 3 or 4 in the chain longitudinal direction It is preferable that they are arranged in a ratio of pieces. This is because when the ratio of the centrally-distributed pitch portion and the centrally concentrated pitch portion to the entire chain 1 is less than the above-mentioned ratio, sufficient flexibility for allowing misalignment cannot be obtained. When the ratio of the central portion and the central concentrated pitch portion to the entire chain 1 is larger than the above ratio, the flexibility of the chain 1 becomes remarkable. Therefore, when the chain 1 is wound around the pulley during operation of the continuously variable transmission, This is because the contact between the sheave surface and the pin end surface becomes unstable, which may reduce the power transmission efficiency.

Further, in each of the embodiments described above, the chain is configured such that the pin end surface of the chain is in contact with the sheave surface of the pulley and performs power transmission, but the power transmission chain according to the present invention is, for example, In addition to the power transmission chain configured to transmit power by the contact surface with the sheave surface provided on the link plate, and the contact member with the sheave surface in addition to the constituent members of the chain of the present embodiment, the chain The present invention can also be applied to a power transmission chain configured to transmit power.
The power transmission chain of the present invention is not limited to the above embodiments, and the configuration of the chain, the shape and arrangement of the link plates, and the like can be changed as appropriate based on the spirit of the present invention.

  The power transmission chain of the present invention can be suitably used for a power transmission device such as a so-called chain type continuously variable transmission. Hereinafter, a chain type continuously variable transmission using a power transmission chain of the present invention according to an embodiment of the power transmission device of the present invention will be described with reference to the drawings. FIG. 6 is a schematic perspective view showing a main configuration of a so-called chain-type continuously variable transmission (hereinafter also simply referred to as “continuously variable transmission”) in which the power transmission chain 1 according to the embodiment of the present invention is used. It is. This continuously variable transmission is mounted on, for example, an automobile, and includes a metal drive pulley 60 serving as a first pulley, a metal driven pulley 70 serving as a second pulley, and a power according to the present invention spanned therebetween. The transmission chain 1 is provided. Note that the cross section of the chain 1 in FIG. 6 is partially shown for easy understanding.

  The drive pulley 60 is attached to an input shaft 61 connected to the engine side so as to be integrally rotatable, and is disposed so as to face the fixed sheave 62 having a conical inclined surface 62a and the inclined surface 62a. And a movable sheave 63 having a conical inclined surface 63a. A groove is formed by the inclined surfaces 62a and 63a of these sheaves, and the chain 1 is held between the grooves with strong pressure. Further, a hydraulic actuator (not shown) is connected to the movable sheave 63 so that the movable sheave 63 can move in the axial direction of the input shaft 61. At the time of shifting, the groove width of the grooves formed by the inclined surfaces 62a and 63a is changed by moving the movable sheave 63 in the axial direction of the input shaft 61. Since the chain width of the chain 1 is always constant, the chain 1 is wound around the drive pulley 60 at a radial position corresponding to the chain width so that the winding radius of the chain 1 around the input shaft 61 can be changed.

  On the other hand, the driven pulley 70 is attached to an output shaft 71 connected to the drive wheel side so as to be integrally rotatable, and has an inclined surface for forming a groove for sandwiching the chain 1 with strong pressure, like the drive pulley 60. A fixed sheave 72 and a movable sheave 73 are provided. A groove is formed by the inclined surfaces 72a and 73a of these sheaves, and the chain 1 is sandwiched and held by the groove with a strong pressure. Further, a hydraulic actuator (not shown) is connected to the movable sheave 73 so that the movable sheave 73 can move in the axial direction of the output shaft 71. When shifting, the movable sheave 73 is moved in the axial direction of the output shaft 71 to change the groove width of the grooves formed by the inclined surfaces 72a and 73a. Since the chain width of the chain 1 is always constant, the chain 1 is wound around the driven pulley 70 at a radial position corresponding to the chain width so that the winding radius of the chain 1 around the output shaft 71 can be changed.

  The chain 1 spanned between the drive pulley 60 and the driven pulley 70 is the chain according to the above-described first embodiment (see FIGS. 1 to 3). Since details are as described above, description thereof is omitted. Of course, the chain according to the second embodiment may be used.

In the continuously variable transmission according to the present embodiment configured as described above, for example, a continuously variable transmission can be performed as follows. That is, when the rotation of the input shaft 61 is decelerated and transmitted to the rotation of the output shaft 21, the groove width on the drive pulley 60 side is increased by the movement of the movable sheave 63 to reduce the winding radius of the drive pulley 60 of the chain 1. At the same time, the groove width on the driven pulley 70 side is reduced by the movement of the movable sheave 73 to increase the winding radius of the driven pulley 70 of the chain 1.
On the contrary, when the rotation of the input shaft 61 is increased and transmitted to the rotation of the output shaft 21, the groove width on the drive pulley 60 side is reduced by the movement of the movable sheave 63 so that the winding radius of the drive pulley 60 of the chain 1 is reduced. At the same time, the groove width on the driven pulley 70 side is increased by the movement of the movable sheave 73 to reduce the winding radius of the driven pulley 70 of the chain 1. In this way, by increasing the wrapping radius of the chain 1 with respect to the input shaft 61 and the output shaft 71, the speed increase and deceleration between the input shaft 61 and the output shaft 71 can be performed.

  In the continuously variable transmission according to the present embodiment configured as described above, even if misalignment exists between the driven pulley 20 as the first pulley and the drive pulley 21 as the second pulley, the chain 1 However, even if the power is transmitted over a long period of time, the occurrence of abnormal wear and abnormal slip can be effectively suppressed. . For this reason, it becomes a continuously variable transmission which can transmit power stably over a long period of time.

  In the above description, the example of the continuously variable transmission using the power transmission chain according to the first embodiment has been described. However, even if the power transmission chain according to the second embodiment is used, abnormal wear is similarly caused. Occurrence of abnormal slip is suppressed, and the continuously variable transmission can stably transmit power over a long period of time.

  The power transmission device of the present invention is not limited to a mode in which the groove widths of both the drive pulley and the driven pulley are changed, but only one of the groove widths is changed and the other is a fixed width that does not change. It may be an embodiment. Moreover, although the aspect in which the groove width fluctuates continuously (steplessly) has been described above, it may be applied to other power transmission devices such as stepped fluctuates and fixed (no gearshift). Good.

It is a perspective view which shows typically the principal part structure of the power transmission chain which concerns on 1st embodiment of this invention. It is the figure which represented typically the arrangement | positioning state with respect to the whole chain of the center uneven distribution pitch part of the power transmission chain which concerns on 1st embodiment of this invention. It is a top plane fragmentary figure which shows the arrangement | sequence of the link plate in the center uneven distribution pitch part of the power transmission chain which concerns on 1st embodiment of this invention. It is a schematic diagram for demonstrating a center uneven distribution pitch part. It is a top plane fragmentary figure which shows the arrangement | sequence of the link plate in the center concentration pitch of the power transmission chain which concerns on 2nd embodiment of this invention. It is a typical perspective view which shows the principal part structure of a chain type continuously variable transmission. It is a schematic diagram for demonstrating misalignment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission chain 20 Link plate 30 Pin 31 Pin end surface 52 Center unevenly distributed pitch part 55 Center concentrated pitch part 56 Both ends concentrated pitch part 60,70 Pulley 62a, 63a, 72a, 73a Sheave surface

Claims (5)

At least as a chain component,
A plurality of link plates having pin holes;
A plurality of pins that are inserted into the pin holes and connect the plurality of link plates;
A pitch portion in which a plurality of the link plates are arranged between two pins adjacent in the longitudinal direction of the chain is continuously connected in the longitudinal direction of the chain,
Used between a first pulley having a conical surface sheave surface and a second pulley having a conical surface sheave surface, wherein the chain component and the first and second pulleys A power transmission chain that contacts the sheave surface and transmits power,
At least one of the pitch portions is a centrally-distributed pitch portion in which the link plate is unevenly distributed in a range near the center in the chain width direction. At least as a chain component,
A plurality of link plates having pin holes;
A plurality of pins that are inserted into the pin holes and connect the plurality of link plates;
A pitch portion in which a plurality of the link plates are arranged between two pins adjacent in the longitudinal direction of the chain is continuously connected in the longitudinal direction of the chain,
Used between a first pulley having a conical surface sheave surface and a second pulley having a conical surface sheave surface, wherein the chain component and the first and second pulleys A power transmission chain that contacts the sheave surface and transmits power,
At least one of the pitch portions is a central concentrated pitch portion in which all link plates constituting the pitch portion are arranged in a range closer to the center in the chain width direction and narrower than the entire width of the chain. For chains.   3. The power transmission according to claim 2, wherein the central concentrated pitch portion is configured such that all of the plurality of link plates constituting the pitch portion are arranged so as to overlap each other near the center in the chain width direction with substantially no gap. For chains.   The pitch plate connected adjacent to both sides of the central concentrated pitch portion in the longitudinal direction of the chain according to claim 3 has link plates arranged at both ends in the chain width direction rather than the link plate arranged at the central concentrated pitch portion. A power transmission chain characterized by being a concentrated pitch portion at both ends. A first pulley having a conical sheave surface;
A second pulley having a conical sheave surface;
A power transmission device comprising a power transmission chain spanned between the first and second pulleys,
The power transmission chain according to any one of claims 1 to 4, wherein the power transmission chain.

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